Depends really, if on std cams little point going past about 6500/6600 as power starts to drop off about there.
Think I would rais eit a bit to around 6800 so you get to fully use up to that point.
Yours may not have a loud bang if it is a soft cut one, on my ecu I set my soft cut at4000, and my hard cut at 4500, on one of my maps, great for flames pops bangs etc seriously loud, but found it kills the plugs, using IK27's it's too costly!!
tabetha